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Large office air conditioner

In my office, the ac does not have any air coming out of the vents. I went up on the roof and found that the unit was on and the fan was spinning at full speed. Is there an internal fan that moves the air? The thermostat is functioning fine. I switched it out for an identical in another place in the building. Help we are cooking!

Mark

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Shut off the cooling and leave the fan in the on position. If the A/C cooling coil is frozen over it will stop air circulation. After you shut the cooling off look down through the fan on the roof top unit and look for any sign of ice on the big line going to the compressor. This would be a sign of the frozen A/C coil. After about an hour or so you should start to feel air movement.

To prevent the coil from freezing up operate the fan in the on position while the air conditioning system is in the A/C mode. Not automatic.

Posted on Jul 11, 2008

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